I was doing around 80km/h and hit a washboard area in the road. The truck began to yaw and was nearly sideways before I was able to recover it. Stabilitrak never kicked on. Road was dry. Bounce was so bad the tonneau cover actually detached and landed on the road. I have the max trailering package so the suspension is tight to begin with. Scared the hell out of me for sure. Bumps, potholes and train track crossings are rough but not to the point of losing control like the washboard area did. Never experienced anything like it in my past GM pickup trucks.
